The registered HTTP alternate port — what web software uses when it cannot have 80.
IANA registers 8080 as http-alt, "HTTP Alternate (see port 80)". It is what unprivileged processes bind because ports below 1024 need root: Tomcat, Jenkins, Spring Boot apps, proxies, and thousands of container images. On a scan it is almost always a real HTTP service sitting behind (or waiting for) a reverse proxy.
Expose with care
The port is legitimate, but what is behind it is often an admin console or an unauthenticated app that assumed a proxy would guard it.
$ curl -sI http://127.0.0.1:8080/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.